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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * accompanied this code).
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package javax.swing.plaf.basic;

import javax.swing.ComboBoxEditor;
import javax.swing.JTextField;
import javax.swing.border.Border;
import java.awt.Component;
import java.awt.event.*;

import java.lang.reflect.Method;

import sun.reflect.misc.MethodUtil;

The default editor for editable combo boxes. The editor is implemented as a JTextField.
Author:
Arnaud Weber, Mark Davidson/**
 * The default editor for editable combo boxes. The editor is implemented as a JTextField.
 *
 * @author Arnaud Weber
 * @author Mark Davidson
 */
public class BasicComboBoxEditor implements ComboBoxEditor,FocusListener {
    
An instance of JTextField. /**
     * An instance of {@code JTextField}.
     */
    protected JTextField editor;
    private Object oldValue;

    
Constructs a new instance of BasicComboBoxEditor. /**
     * Constructs a new instance of {@code BasicComboBoxEditor}.
     */
    public BasicComboBoxEditor() {
        editor = createEditorComponent();
    }

    public Component getEditorComponent() {
        return editor;
    }

    
Creates the internal editor component. Override this to provide
a custom implementation.
Returns:
a new editor component
Since:
1.6/**
     * Creates the internal editor component. Override this to provide
     * a custom implementation.
     *
     * @return a new editor component
     * @since 1.6
     */
    protected JTextField createEditorComponent() {
        JTextField editor = new BorderlessTextField("",9);
        editor.setBorder(null);
        return editor;
    }

    
Sets the item that should be edited.
Params:
anObject – the displayed value of the editor/**
     * Sets the item that should be edited.
     *
     * @param anObject the displayed value of the editor
     */
    public void setItem(Object anObject) {
        String text;

        if ( anObject != null )  {
            text = anObject.toString();
            if (text == null) {
                text = "";
            }
            oldValue = anObject;
        } else {
            text = "";
        }
        // workaround for 4530952
        if (! text.equals(editor.getText())) {
            editor.setText(text);
        }
    }

    public Object getItem() {
        Object newValue = editor.getText();

        if (oldValue != null && !(oldValue instanceof String))  {
            // The original value is not a string. Should return the value in it's
            // original type.
            if (newValue.equals(oldValue.toString()))  {
                return oldValue;
            } else {
                // Must take the value from the editor and get the value and cast it to the new type.
                Class<?> cls = oldValue.getClass();
                try {
                    Method method = MethodUtil.getMethod(cls, "valueOf", new Class<?>[]{String.class});
                    newValue = MethodUtil.invoke(method, oldValue, new Object[] { editor.getText()});
                } catch (Exception ex) {
                    // Fail silently and return the newValue (a String object)
                }
            }
        }
        return newValue;
    }

    public void selectAll() {
        editor.selectAll();
        editor.requestFocus();
    }

    // This used to do something but now it doesn't.  It couldn't be
    // removed because it would be an API change to do so.
    public void focusGained(FocusEvent e) {}

    // This used to do something but now it doesn't.  It couldn't be
    // removed because it would be an API change to do so.
    public void focusLost(FocusEvent e) {}

    public void addActionListener(ActionListener l) {
        editor.addActionListener(l);
    }

    public void removeActionListener(ActionListener l) {
        editor.removeActionListener(l);
    }

    @SuppressWarnings("serial") // Superclass is not serializable across versions
    static class BorderlessTextField extends JTextField {
        public BorderlessTextField(String value,int n) {
            super(value,n);
        }

        // workaround for 4530952
        public void setText(String s) {
            if (getText().equals(s)) {
                return;
            }
            super.setText(s);
        }

        public void setBorder(Border b) {
            if (!(b instanceof UIResource)) {
                super.setBorder(b);
            }
        }
    }

    
A subclass of BasicComboBoxEditor that implements UIResource.
BasicComboBoxEditor doesn't implement UIResource
directly so that applications can safely override the
cellRenderer property with BasicListCellRenderer subclasses.

Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing.  As of 1.4, support for long term storage
of all JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. /**
     * A subclass of BasicComboBoxEditor that implements UIResource.
     * BasicComboBoxEditor doesn't implement UIResource
     * directly so that applications can safely override the
     * cellRenderer property with BasicListCellRenderer subclasses.
     * <p>
     * <strong>Warning:</strong>
     * Serialized objects of this class will not be compatible with
     * future Swing releases. The current serialization support is
     * appropriate for short term storage or RMI between applications running
     * the same version of Swing.  As of 1.4, support for long term storage
     * of all JavaBeans&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial") // Same-version serialization only
    public static class UIResource extends BasicComboBoxEditor
    implements javax.swing.plaf.UIResource {
    }
}